Fire door



`A. I. BOEHM, D ECD. F. A. BUEHM, ADMINISTRATRIX.

. FIRE 000B.

APPLICATION FILED IlIN-E B. I9I8.

ufff* Patented June 13, 1922.

ADOLPH J". BOEHM, 0F NEW YORK, N. Y.; FLORENCE A. BOEHM ADMINISTRATRIX 0]? SAID ADOLPI-I J. BOEHNI, DECEASED.

FIRE Doon.

To all whom t may concern Be it known that I, ADoLPH J. BonHM, a citizen of the United States, residing at New York, in the county of N ew York and State of New York, have invented new and useful Improvements in Fire Doors, of which the following is a specification.

This invention relates to furnaces, particularly to doors thereforl and has for its object the provision of a door particularly adapted for use upon furnaces in which a high degree of heat is employed, my improved door comprising a body portion formed as a single slab of fire brick, which is mounted between mating sections of a supporting iron frame-work which is clamped around it in such a manner as to hold the lire brick firmly in position to prevent breaking or cracking the edges.

An important object is the provision of a door of this character in which the two supporting frame sections are connected by bolts which pass through adjacent lugs on the frame sections, the lugs being thin compared with the frame so that the frame may give to a certain extent to permit expansion and contraction under varying degrees of temperature.

Another object is the provision of a door of this character which will be extremely simple and inexpensive' in manufacture, highly efiicient and durable in use, which will withstand a high temperature, and which will be a general improvement of the art.

With the above and other objects and advantages in view, the invention consists in the novel construction and arrangement to be hereinafter more fully described and claimed and illustrated in the accompanying drawings, in which- Figurel 1 is a front elevation of the door,

Figure 2 is a rear elevation thereof,

Figure 3 is a cross sectional view on the line 3 3 of Figure 2, and

Figure 4 is a perspective view of one of the frame sections. f

In carrying out the invention the door is formed of a single slab 11 of fire brick which is formed preferably rectangular in shape with the curved top edge 12, as shown. It will be understood, however, that any other desired shape may be employed if desired, the particular configuration not constituting an important feature of the inven- Application filed June 8, 1918. Serial No. 238,965.

svpecication of Letters Patent. Patented J une 13, 1922.

tion. In order to support the slab 11 so that it may be operatively associated with the front of the furnace, a frame structure v-is provided which comprises two substantially similar sections 13 and 14 whichare preferablyY formed by casting. The sections 13 and 14 are similar in construction and each includes` a band portion 15adapted to engage the edges of the slab 11 and a flanged portion 16 adapted to engage a sheet of asbestos 17 disposed upon the outer face of the slab 10. The frame section 13 hasits upper portion curved as shown at 18, to conform to the curvature 12 of the slab 11 so that the frames will conform to the specific configuration of the slab. Both of the frame sections 13 and 14 are provided with lugs 19 adapted to cooperate with lugs fixed upon the front of a furnace and to be pivotally connected therewith by means of suitable bolts or pins forming a hinged structure. By this hinged structure it will be understood that the door is of course swung to open and closed position in the usual manner. Any suitable form of catch, not shown, may be employed to hold the door in its closed position. The lower frame section 14 is further provided with a lug 22 forming a lift whereby the door may be opened.

In order that the frame sections 13 and 14 may be secured upon the slab 11 and asbestos sheet 17, each end of the band portion 15 of each section of the frame is provided with an outwardly extending ear 23 which is of relatively slight thickness compared with the thickness of the band portion. The adjacent pairs of ears 23 are apertured for the passage of clamping bolts 24 upon which are engaged nuts 25, whereby the frame sections may be firmly clamped upon the edges of the slab.

The formation of the ears 23 of less thickness than the band 15 is an important point for the reason that it permits a certain degree of expansion of the frame sections when the slab 11 expands under the influence of heat, the comparative thinness of the ears givingl them a small degree of iiexibility so that the sections may move relatively to one another in addition to the expansion of the metal itself, as will be readily understood.

The door is assembled by placing the frame sections 13 and 14 upon the slab 11 upon which has been previously placed the asbestos sheet 17, after which the bolts 24 are passed through the ears 23 and the nuts Qsapplied `to the ,boltsl and screwed down Y suficiently to clamp the framejsections upon the slab to the desired degree of pressure.

From the foregoing description and 'a study of the drawings, it will be apparent thatlf, havgethusprovided a door whichwill be capable of withstanding a high degree of heat, which is formed as a Vs'ingl'e'slab of fire clay, Iand which will be consequently free from thedlsadvanta'ges Aoi structures involvtlie use fofa y'plurality of such, parts, and which has its Supporting Ktraine fully capablef of expanding and Contracting substantially unison with the expansion and contraction of 'the slab under 'the influence of heat 4. i,

'Having thus describefdrhy 'invention what I `claim 'as new and desireto secure by 'pat et: if v A furnace door comprising a single slab of fire brick, a sheet of asbestos disposed against one side thereof, 4a supporting frame comprising a Apair of metallic sections each L-shaped in cross section and including a band portion engaging and entirely cover-V ing the edges of said slab and further includ `ing a flanged portion engaging said sheet of asbestos adjacentyits edges whereby to hold said sheet of asbestos in engagementwith said slab, outwardly extending ears at theY ADOLPH J BOEHM. 

